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Visible Light Promoted Iron-Catalyzed One-Pot Synthesis of 2-Arylimino-2H-Chromenes from 2-Hydroxybenzyl Alcohols and β- Ketothioamides at Room Temperature |
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| Authors: | Dr Mohd Waheed Dr Meshari A Alsharif Dr Mohammed Issa Alahmdi Dr Sayeed Mukhtar Dr Humaira Parveen |
| Institution: | 1. Department of Chemistry, Indian Institute of Technology Roorkee, 247-667 Roorkee, India;2. Chemistry Department, Faculty of Applied Science, Umm Al-Qura University, 24382 Makkah, Saudi Arabia;3. Department of Chemistry, Faculty of Science, University of Tabuk, 71491 Tabuk, Saudi Arabia |
| Abstract: | An efficient, environmentally benign and one-pot approach for the synthesis of 2-arylimino-2H-chromenes from 2-hydroxybenzyl alcohols and β-ketothioamides at room temperature under visible light has been developed. The reported reaction conditions were favorable for a wide range of β-ketothioamides afforded good to excellent yields of the respective products. The low cost and air stable Knölker iron catalyst has been employed for the dehydrogenation of 2-hydroxybenzyl alcohols under photolysis that would usually require a higher temperature. |
| Keywords: | 2-arylimino-2H-chromenes 2-hydroxybenzyl alcohol β-ketothioamides Knölker complex visible light |